I agree with UCE. Simply turn off the option for people to send you anonymous feedback. After all, the people who send anonymous negative feedback have probably never tried to write a story. So anything they have to say probably isn't worth reading.
All that matters to me in the long run when I write a story is how much I like it. Although, positive feedback does let me know that the message in my story came through loud and clear.
No matter what kind of stories we chose to write, its just a way we all expressive our individuality. If other people can't appreciate that, then thats their problem.
So Wildfire427, keep writing and smiling even if there are a few critics out there. At least YOU know that you did a great job with your story and thats the only opinion that truely counts.